原子荧光光谱法测定煤中汞含量

Determination of mercury in coal by Atomic Fluorescence Spectrometry

煤炭燃烧过程中释放的汞是大气中汞的首要来源,为促进煤炭的清洁利用,试采用原子荧光光谱法,研究不同消解体系下的煤样消解方法.在总结常用煤炭消解方法和汞含量测定方法的基础上,以原子荧光光谱仪为测汞仪器,首先优化了仪器工作参数,然后使用四种消解方法对三种性质不同的煤样分别进行了消解与汞含量测定实验.结果表明:V_2O_5-HNO_3-H_2SO_4-H_2O_2消解体系对实验中对比的三种煤样均取得了较高的消解效率和汞溶出率,虽然加标回收率略低,但在标准范围内;其他方法的消解效率则受煤样性质影响较大,仅针对某种特定性质的煤样效果较好.因此,在测定煤中汞含量时,应充分了解煤样性质,在此基础上合理地选择消解方法.

The mercury released in the process of coal combustion is the primary source of mercury in the atmosphere. In order to promote the clean utilization of coal, the method of Atomic Fluorescence Spectrometry is used to study the method of digestion of coal samples under different digestion systems. On the basis of summarizing the common coal digestion method and the content of mercury determination method, taking the atomic fluorescence spectrometer as the mercury measurement instrument, the instrument working parameter was optimized firstly, and then four digestive methods to digest three kinds of properties of different coal sample were used and the experiment of mercury content was carried out respectively. The results showed that V2O5-HNO3- H2SO4-H2O2 digestion system achieved higher resolution efficiency and the mercury dissolution rate in the comparison of three kinds of coal samples in the experiment. Although the recovery rate was slightly lower, it was within the standard range; other methods of digestion efficiency were greatly influenced by the nature of the coal sample, and the coal sample only had good effect on certain properties. Therefore, in the determination of mercury content in coal, it was necessary to fully understand the coal sample property, and select the digestion solution reasonably.